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Type: Artigo de periódico
Title: Electrocatalytic oxidation of nitrite on a carbon paste electrode modified with Co(II) porphyrin adsorbed on SiO2/SnO2/phosphate prepared by the sol-gel method
Author: Cardoso, WS
Gushikem, Y
Abstract: This paper describes the immobilization of 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21H,23H-porphyrin ion on SiO2/SnO2/Phosphate obtained by the sol-gel processing method. The porphyrin was adsorbed on the surface of the modified material and furthermore metallized in situ with Co(II) ion. The porphyrin metallation process was followed using UV-Vis spectroscopy by inspecting the Q bands of the free and metallated porphyrin. A carbon paste electrode modified with material containing metallated porphyrin was used to study the electro-catalytic oxidation of nitrite ions by means of cyclic voltammetry, chronoamperometry and RDE voltammetry. The modified electrode was very stable and exhibited the electro-catalytic oxidation of nitrite ions at 0.72 V vs. SCE by a two electron mechanism producing nitrate ions at pH 5.4. The kinetic parameters of the electrode reaction process were calculated; (1 - alpha)n(a) was 0.479, D was (5.3 +/- 0.11) x 10(-5) cm s(-1), and k(0) could be determined as (5.4 +/- 10.14) x 10(-3) cm s(-1). (c) 2005 Elsevier B.V. All rights reserved.
Subject: SiO2/SnO2
mixed oxide
carbon paste electrode
nitrite sensor
chemically modified electrode
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Electroanalytical Chemistry. Elsevier Science Sa, v. 583, n. 2, n. 300, n. 306, 2005.
Rights: fechado
Identifier DOI: 10.1016/j.jelechem.2005.06.015
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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